일정 계수 알고리듬과 결정지향 알고리듬을 바탕으로 하는 새로운 등화 기법
A Blind Equalization Method Using Dual-Mode Modified Constant Modulus Algorithm and Decision Directed Algorithm
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초록
이 논문에서는 오차가 작고 수렴 속도도 빠른 새로운 눈 먼 등화기를 (blind equalizer) 제안한다. 제안한 등화기는 두 방식 고친 일정 계수 알고리듬과(dual-mode MCMA: dual-mode Modified Constant Modulus Algorithm) 결정지향 알고리듬의(DD algorithm: Decision-Directed algorithm) 특성을 모두 살릴 수 있도록 수렴 탐지기를 쓴다. 수렴 탐지기는 등화 알고리듬이 두 방식 고친 일정 계수 알고리듬에서 결정지향 알고리듬으로 바뀌는 시점을 찾아 준다. 제안한 알고리듬이 이제까지의 알고리듬과 견주어 성능이 뛰어나다는 것을 모의실험으로 보인다.
Abstract
In this paper, a novel blind equalizer exhibiting a low residual error and fast convergence speed is proposed. The proposed equalizer employs the dual-mode modified constant modulus algorithm (MCMA) with modified parameters in the blind mode and the decision-directed (DD) algorithm in the steady-state mode after convergence. A convergence detector is proposed to help the dual-mode MCMA switch to the DD algorithm. Simulation results show that the proposed equalizer has a better performance in comparison with the constant modulus algorithm (CMA), MCMA, and dual-mode MCMA.
참고문헌 (12)
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